{"id":34202,"date":"2021-09-10T11:45:00","date_gmt":"2021-09-10T09:45:00","guid":{"rendered":"https:\/\/foretnature.be\/resume-foret-mail\/lumiere-et-croissance-juvenile\/"},"modified":"2021-09-10T11:45:00","modified_gmt":"2021-09-10T09:45:00","slug":"lumiere-et-croissance-juvenile","status":"publish","type":"resume-foret-mail","link":"https:\/\/foretnature.be\/en\/resume-foret-mail\/lumiere-et-croissance-juvenile\/","title":{"rendered":"Lumi\u00e8re et croissance juv\u00e9nile"},"content":{"rendered":"

Cotyl\u00e9dons de h\u00eatre \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a9 Lutz Peter\/fotolia
\nLa lumi\u00e8re est un des principaux facteurs ext\u00e9rieurs affectant la structure du sous-bois et le d\u00e9veloppement de la r\u00e9g\u00e9n\u00e9ration. La r\u00e9action de trois esp\u00e8ces (h\u00eatre, fr\u00eane et \u00e9rable sycomore) a \u00e9t\u00e9 analys\u00e9e selon un gradient lumineux, en termes d\u2019affectation de biomasse au-dessus du sol (feuilles, troncs et tiges) et de croissance.Le h\u00eatre a allou\u00e9 plus de biomasse \u00e0 ses branches et moins \u00e0 sa tige, par rapport aux deux autres esp\u00e8ces, comportement d\u00fb \u00e0 sa grande tol\u00e9rance \u00e0 l\u2019ombre. L\u2019\u00e9rable et le fr\u00eane ont ainsi, au contraire du h\u00eatre choisi de faire grandir leur tige pour d\u00e9passer le masque ombrageant qui les surplombait.
\nLe taux de croissance relatif de toutes les esp\u00e8ces a augment\u00e9 avec la quantit\u00e9 de lumi\u00e8re disponible jusqu\u2019\u00e0 atteindre un seuil o\u00f9 l\u2019accroissement en lumi\u00e8re n\u2019a plus eu d\u2019impact. La surface foliaire a quant \u00e0 elle diminu\u00e9e avec l\u2019augmentation du gradient de lumi\u00e8re.
\nAnnigh\u00f6fer P., Petritan A. M., Petritan I. C., Ammer C. (2017). Disentangling juvenile growth strategies of three shade-tolerant temperate forest tree species responding to a light gradient. Forest Ecology and Management\u00a0n\u00b0 391. doi : 10.1016\/j.foreco.2017.01.010<\/p>","protected":false},"excerpt":{"rendered":"

Cotyl\u00e9dons de h\u00eatre \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 […]<\/p>","protected":false},"featured_media":0,"template":"","categories":[50],"acf":[],"yoast_head":"\nLumi\u00e8re et croissance juv\u00e9nile - For\u00eat.Nature<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/foretnature.be\/en\/resume-foret-mail\/lumiere-et-croissance-juvenile\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lumi\u00e8re et croissance juv\u00e9nile - For\u00eat.Nature\" \/>\n<meta property=\"og:description\" content=\"Cotyl\u00e9dons de h\u00eatre \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/foretnature.be\/en\/resume-foret-mail\/lumiere-et-croissance-juvenile\/\" \/>\n<meta property=\"og:site_name\" content=\"For\u00eat.Nature\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/foretnature.be\/resume-foret-mail\/lumiere-et-croissance-juvenile\/\",\"url\":\"https:\/\/foretnature.be\/resume-foret-mail\/lumiere-et-croissance-juvenile\/\",\"name\":\"Lumi\u00e8re et croissance juv\u00e9nile - 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